Sandleford Priory is a largely 18th century country house at Sandleford in the civil parish of Greenham in the English county of Berkshire. It incorporates the chapel of a former monastery and is currently the home of St Gabriel's School. After the old monastery on the site was abandoned by its canons, the estate was given to the Dean and Canons of Windsor. They leased it out as a farm to various tenants before the Kingsmill family from Sydmonton Court converted it into a country house. This was subsequently much extended and elaborated by a later resident, Mrs. Elizabeth Montagu.